What is missing..?

[nodemon]

I know, dumb question I'm sure...but what is the part called that covers this....

 

[missing linc]

Looks like the steel plate between the engine and bellhousing is missing, as well as the inspection cover from the bottom of the bellhousing.

 

[DustyEd]

Bell housing dust cover and starter/flywheel dust cover (front plate). At least, that's what I call them.

 

[RAT ROD AL]

Check out Brewers 4spd parts on line. They have all this stuff.

 

[cudamark]

Looks like you're missing the release bearing fork too.